~gjabell/mfn

ref: c133234de8fa2e467c956224945a85694cc00cbf mfn/main.go -rw-r--r-- 4.9 KiB
c133234dGalen Abell Update README 1 year, 7 months ago
                                                                                
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package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"html/template"
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"strconv"
	"strings"
	"time"

	"git.sr.ht/~sircmpwn/getopt"
	"github.com/BurntSushi/toml"

	mf "miniflux.app/client"
)

var version = "0.1.0"
var webhookTemplate *template.Template

type config struct {
	Server          string `toml:"server"`
	Username        string `toml:"username"`
	Password        string `toml:"password"`
	DbPath          string `toml:"db_path"`
	WebhookTemplate string `toml:"webhook_template"`
	WebhookURL      string `toml:"webhook_url"`
}

func loadConfig(configPath string) (*config, error) {
	var c config

	if _, err := toml.DecodeFile(configPath, &c); err != nil {
		return nil, err
	}

	// validation
	for k, v := range map[string]string{
		"server url":       c.Server,
		"username":         c.Username,
		"password":         c.Password,
		"database path":    c.DbPath,
		"webhook template": c.WebhookTemplate,
		"webhook url":      c.WebhookURL,
	} {
		if v == "" {
			return nil, fmt.Errorf("you must provide a valid %s", k)
		}
	}

	// parse the template
	tmpl, err := template.New("webhook").Parse(c.WebhookTemplate)
	if err != nil {
		return nil, err
	}
	webhookTemplate = tmpl

	return &c, nil
}

func loadLastEntry(filepath string) (int64, error) {
	bytes, err := ioutil.ReadFile(filepath)
	if err != nil {
		if os.IsNotExist(err) {
			// no last entry
			return -1, nil
		}
		return -1, err
	}

	str := strings.TrimSpace(string(bytes))
	id, err := strconv.ParseInt(str, 10, 64)
	if err != nil {
		return -1, err
	}

	return id, nil
}

func saveLastEntry(filepath string, id int64) error {
	return ioutil.WriteFile(filepath, []byte(strconv.FormatInt(id, 10)), 0644)
}

func sendWebhook(entry *mf.Entry, webhookURL string) error {
	var text bytes.Buffer
	if err := webhookTemplate.Execute(&text, entry); err != nil {
		return err
	}

	body := map[string]string{"text": text.String(), "format": "html", "displayName": "Miniflux", "avatarUrl": "https://miniflux.app/favicon.ico"}
	jsonVal, err := json.Marshal(body)
	if err != nil {
		return err
	}

	res, err := http.Post(webhookURL, "application/json", bytes.NewBuffer(jsonVal))
	if err != nil {
		return err
	}
	resBytes, err := ioutil.ReadAll(res.Body)
	if err != nil {
		return nil
	}
	log.Printf("Webhook response: %s", string(resBytes))

	return nil
}

func testWebhook(webhookURL string) error {
	e := &mf.Entry{
		ID:         0,
		UserID:     0,
		FeedID:     0,
		Status:     "unread",
		Hash:       "deadbeef",
		Title:      "Test Entry",
		URL:        "https://miniflux.app",
		Date:       time.Now(),
		Content:    "This is a test miniflux entry",
		Author:     "Author",
		Starred:    false,
		Enclosures: make([]*mf.Enclosure, 0),
		Feed:       nil,
	}

	return sendWebhook(e, webhookURL)
}

func main() {
	showHelp := getopt.Bool("h", false, "show usage")
	webhookTest := getopt.Bool("t", false, "test the webhook endpoint")
	showVersion := getopt.Bool("v", false, "show version")
	var configPath string
	getopt.StringVar(&configPath, "c", "", "configuration file path")

	err := getopt.Parse()
	if err != nil {
		log.Fatalf("Failed to parse args: %s", err)
	}

	if *showHelp {
		fmt.Println("Usage: mfw [-v] [-t] -c config")
		os.Exit(0)
	}

	if *showVersion {
		fmt.Printf("mfw %s\n", version)
		os.Exit(0)
	}

	if configPath == "" {
		log.Fatal("You must specify a config location")
	}

	conf, err := loadConfig(configPath)
	if err != nil {
		log.Fatalf("Failed to load config: %s\n", err)
	}

	if *webhookTest {
		log.Println("Sending test webhook...")
		if err := testWebhook(conf.WebhookURL); err != nil {
			log.Fatalf("Test webhook failed: %s\n", err)
		}
		os.Exit(0)
	}

	client := mf.New(conf.Server, conf.Username, conf.Password)

	lastEntry, err := loadLastEntry(conf.DbPath)
	if err != nil {
		log.Fatalf("Failed to load last entry: %s\n", err)
	}

	var notify bool
	filter := &mf.Filter{Order: "id"}
	if lastEntry == -1 {
		// this is the first run, since we don't have a last entry
		// in this case, just request the single most recent entry
		// this will be the entry with the largest ID
		filter.Limit = 1
		filter.Direction = "desc"
		// don't send notifications on the first run
		notify = false
	} else {
		// if we already have entries, request all entries since the
		// last entry ID
		filter.Limit = 0
		filter.Direction = "asc"
		filter.AfterEntryID = lastEntry
		notify = true
	}

	newEntriesSet, err := client.Entries(filter)
	if err != nil {
		log.Fatalf("Failed to fetch entries: %s\n", err)
	}

	newEntries := newEntriesSet.Entries
	for _, e := range newEntries {
		log.Printf("New entry: %d\n", e.ID)

		if e.ID > lastEntry {
			lastEntry = e.ID
		}

		if !notify {
			continue
		}

		if err := sendWebhook(e, conf.WebhookURL); err != nil {
			log.Printf("Failed to send webhook: %s\n", err)
		}
	}
	log.Printf("Saving new last entry: %d\n", lastEntry)
	if err := saveLastEntry(conf.DbPath, lastEntry); err != nil {
		log.Fatalf("Failed to save new entries: %s\n", err)
	}
}